Why are X-linked recessive genetic disorders more commonly seen in males?
a. For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which
females do not have.
b. Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy.
c. The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have.
d. Females only have X chromosomes and genes on the X chromosome are not expressed.
b. Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy.
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Answer the following statements true (T) or false (F)
1. The type of cellular response that is caused by a given signaling molecule depends on the type of cell responding to the signal. 2. Apoptosis can occur via both intrinsic and extrinsic pathways. 3. Apoptosis is necessary in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer. 4. Ligands that promote cell death are typically produced on the surface of cells of the immune system that recognize abnormal cells and target them for destruction.
Which of the following statements is TRUE about chromosomes?
a. Chromosomes are always spread out as chromatin. b. Chromosomes are always condensed. c. Homologous chromosomes have the same genes on them but can have different alleles. d. Homologous chromosomes have the same genes on them and always have the same alleles of those genes. e. Chromosomes always consist of two sister chromatids.
When repolarization is occurring during an action potential, ________ channels are closed
Fill in the blank(s) with correct word
The cells of the immune system that are responsible for attacking cells that have been infected with a virus are the:
a. B-cells b. cytotoxic T-cells c. helper T cells d. suppressor T cells (T regulatory cells)